You all may know RL solutions, only thing I can imagine to help would be an improved form of secure heliograph
Letting everyone see your heliograph is less than ideal at.times.
Imagine something akin to a reflector telescope:
Say a 2 or 3 foot long by 6 inch wide tube
At the rear a small "shuttered" heliograph and if need for great ranges, maybe a heliograph powered by chemical reaction lighting instead of a kerosene lamp at night or when dull (perhaps a form of lime light?)
A small telescope fixed to the main tube to align with another heliograph and read its.messages.
Interior of large tube darkened to reduce any spilled light (coat it with black paint sprinkled with carbon black?)
That would reduce the odds of anyone seeing the light messages except for a very narrow cone...or if the weather was foggy
Ok, limited use, but at least it's an idea! :p
Secure signalling for artillery, commandos etc, only practical for calm waters so less use for navy than army, and replace existing semaphore system?
The big Church-built semaphore towers should be suitable to house these, give better performance and more security,.maybe use larger version of this system for those?
Airships have hydrogen and thus...limelight version?
We know Charis has limelight search light/communications light on their airships now.
Anyone else have ideas?
